已知X、Y、Z、W均为中学化学中常见的单质或化合物，它们之间的转化关系如图所示(

Doctors Without Borders (国界)

Chris is not a traditional explorer— he usually works in an office for a large organization. However, Chris' job can be just as exciting and dangerous as being an explorer.

Chris works for MSF, an organization also known as Doctors Without Borders. Since 1971, MSF has sent trained doctors all over the world to help people who have suffered from disasters (遭受灾难), such as wars and illnesses. Chris is a doctor from France who has traveled to many places to organize programs that help people.

At the moment,  over 27,000 trained doctors have taken part in MSF projects. The organization received the Nobel Peace _ Prize in 1999. All kinds of doctors can volunteer for MSF. They need to be ready to go almost anywhere in the world and, of course, they should face difficulties. Most of MSF's work is in Africa. When MSF chooses a doctor for a task, they have to go for at least six months. When doctors have completed a few tasks, they might be sent on an emergency(紧急的) task following a disaster, such as an earthquake.

But why would doctors leave a comfortable life and a good pay to join MSF? According to Chris, the experience they have is a great help in their life. What's more, just like the explorers of the past, they need to keep an open mind and learn to get on well with the people they meet One thing that they can say at the end of any task is that they have made a real difference to people's lives.

小题1:What may MSF's work be like?

A．Tiring and boring.

B．Exciting and dangerous.

C．Relaxing and colorful.

D．Peaceful and comfortable.小题2:As a volunteer doctor for MSF, he or she should_.

A．have worked in Africa for six months

B．have been sent on an emergency task

C．be ready to work for a task for at least half a year

D．have suffered from wars, illnesses or other disasters小题3:Why would doctors like to join MSF?

A．Because they can get a good pay.

B．Because they can have a comfortable life.

C．Because they can help others and get experience.

D．Because they can travel abroad with their families.小题4:What is the main idea of this passage?

A. Chris is a doctor who has organized programs to help people.

B. MSF received the Nobel Peace Prize for helping poor countries.

C. Volunteer doctors make a real difference to their own lives in MSF.

D MSF offers medical help to people who have suffered from disasters.

诗文填空。

（1）海内存知己，________。

（2）度尽劫波兄弟在，________。

（3）人有悲欢离合，________，此事古难全。

（4）四面边声连角起，千嶂里，________。

（5）________，草色人帘青。________，往来无白。

（6）山行六七里，________，酿泉也。

（7）在我国古代诗歌创作中，爱国主义是一个永恒的主题。李贺在《雁门太守行》中以“报君黄金台上意，提携玉龙为君死”抒发了报效国家，勇于献身的激情；杜牧在《泊秦淮》中以“________，________”表达了自己对封建统治者腐朽生活的痛恨之情；文天祥在《过零丁洋》中以“________，________”展现了以身献国，痴心不改的情怀。

（7分）为了探究HClO的漂白性，某同学设计了如下的实验。

（1）通入Cl₂后，从集气瓶A中干燥的红色布条的现象可得出的结论是                 ；从集气瓶B中湿润的红色布条的现象可得出的结论是                  ，其中发生的反应的化学方程式为                                              。

（2）为了确证是HClO使湿润的红色布条褪色，你认为还应增加的实验是              。

（3）烧杯中溶液所起的作用是                                           ，烧杯中所发生反应的化学方程式为                                    。

（4）为保证实验安全，当氯气以每分钟1.12L（标准状况）的流速匀速通入时，若实验需耗时4分钟，小烧杯中盛2 mol·L^—1的NaOH溶液的体积至少应为__________mL。

在山区道路遇对向来车时，应怎样会车？

A．不减速

B．紧靠道路中心

C．加速

D．减速或停车让行

公差带一端是开口的，另一端由（）限定。

A.偏差

B.基本偏差

C.标准公差